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YAML to TOML Converter

YAML to TOML Converter

Convert YAML configuration files to TOML format with validation

YAML Input

About YAML to TOML

YAML - Human-readable configuration format with indentation-based structure.

TOML - Tom's Obvious Minimal Language, a simple configuration file format.

Note: This converter handles basic YAML structures. For complex nested objects, use a dedicated parser.

Examples

Convert simple scalar values

Input
name: DevTools
version: 2
debug: false
Output
name = "DevTools"
version = 2
debug = false

Unquoted text receives double quotes, while a number and boolean are emitted directly.

Observe nested mapping flattening

Input
server:
  host: localhost
  port: 8080
Output
server = ""
host = "localhost"
port = 8080

The empty parent key becomes an empty string and indentation is discarded, so child keys are not placed in a TOML table.

Convert booleans, null, and quoted text

Input
enabled: true
optional: null
title: 'My App'
Output
enabled = true
optional = 
title = 'My App'

Existing quotes are preserved, while null produces an empty assignment that must be reviewed before using the result as TOML.

About this tool

The YAML to TOML Converter performs a lightweight, line-by-line conversion for simple YAML configuration values. It ignores blank lines and full-line comments, recognizes keys made from letters, digits, underscores, or hyphens, and emits one TOML-style key/value assignment for each recognized line.

Booleans and numeric strings are emitted without quotes, null becomes an empty value, already single- or double-quoted values keep their quotes, and other scalar text receives double quotes. A key with no value becomes an empty string assignment. The output can be copied or downloaded as config.toml.

This is not a full YAML parser and it does not construct TOML tables. Indentation is read but not used, so nested mappings are flattened into independent assignments and duplicate keys can result. The component itself recommends a dedicated parser for complex nested objects.

How to use

  1. Enter simple YAML

    Paste scalar key/value lines into the YAML input, or click Load Sample to inspect the converter's supported behavior.

  2. Convert the content

    Click Convert to TOML. Blank lines and lines beginning with # are skipped.

  3. Review flattened output

    Check quoting, null values, and nested keys carefully because the converter processes each recognized line independently.

  4. Copy or download

    Copy the generated text or download it as config.toml after confirming it is valid for your target application.

Use cases

Convert a flat configuration draft

Turn a short list of scalar YAML settings into TOML-style assignments without installing a command-line converter.

Prototype a migration

Generate a starting point for a configuration-format migration, then manually add TOML tables and correct unsupported values.

Compare scalar syntax

Use a small sample to see how booleans, numbers, quoted strings, plain strings, and null are handled by this component.

Create a downloadable starting file

Convert reviewed flat input and download the result as config.toml for further editing.

Common mistakes

Mistake:Using nested YAML and expecting TOML table headers.

Fix:Use this tool only for flat scalar data, or manually restructure the flattened output into TOML tables.

Mistake:Assuming null converts to valid TOML.

Fix:Review every null value: the converter emits an empty right-hand side, so replace it with a valid application-specific value or remove the key.

Mistake:Expecting arrays, block scalars, anchors, aliases, or inline objects to be parsed.

Fix:Use a dedicated YAML parser and TOML serializer for complex YAML features.

Mistake:Trusting the success toast as full syntax validation.

Fix:Validate the downloaded result with the TOML parser used by your application; this converter does not parse its generated TOML.

Frequently asked questions

Related guides

Moving Configuration Between TOML, JSON and YAML: What Survives the Trip

Converting config formats sounds trivial until your dates vanish, your comments disappear, and your multiline string gets folded into one line.

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